The island was once the home of puffins and Manx shearwater. A guide book in the 1890s referred to the puffins as “Welsh parrots”. In 1924 Welsh writer and naturalist Ronald Lockley wrote that there were probably 25 to 30 pairs on the island. However, in 1934 the liner Herefordshire[1] ran aground on the island in a storm, and rats made it ashore. Over a period of years they ate the eggs and chicks of nesting seabirds, and wiped out the island’s population of puffin and Manx shearwater, which have never returned.[2]

Today birds such as guillemots, razorbills, cormorants, shags, fulmars and a variety of sea-gulls all nest on the island. Bottlenose dolphins and Atlantic grey seals are also often seen in the sea around the island.[3]